import org.apache.commons.lang.ArrayUtils;
import org.junit.Test;


public class ArrayUtilsTest {

	@Test
	public void test(){
		
		String[] strs = new String[]{"abc", "sdf", "asdfwer", "werqwer"}; 
		String[] strs2 = null; 
		System.out.println(ArrayUtils.indexOf(strs2, "werqwer"));
	}
}
